18021875 has 24 divisors (see below), whose sum is σ = 23123520. Its totient is φ = 14040000.

The previous prime is 18021841. The next prime is 18021889. The reversal of 18021875 is 57812081.

It is a happy number.

It is not a de Polignac number, because 18021875 - 2¹⁰ = 18020851 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 228086 + ... + 228164.

It is an arithmetic number, because the mean of its divisors is an integer number (963480).

Almost surely, 2^18021875 is an apocalyptic number.

18021875 is a deficient number, since it is larger than the sum of its proper divisors (5101645).

18021875 is an frugal number, since it uses more digits than its factorization.

18021875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 18021875 is about 4245.2178978234. The cubic root of 18021875 is about 262.1802607361.

The spelling of 18021875 in words is "eighteen million, twenty-one thousand, eight hundred seventy-five".